Item Type: Pet Water Fountain Filter Material: Activated Carbon, Resin Size: Approx. 15 x 15cm / 5.9 x 5.9in Caliber: Diameter: Approx. 3cm/1.2in Recommendation: Rinse the filter thoroughly with water before use. Replace every 2 to 4 weeks to keep water fresh. Use fountains to change multiple pets more frequently. Package List 12 x Sheets of Pet Water Fountain Filter 1. Manual measurement, please allow some errors.2. Please measure your pet's water dispenser before purchasing the filter to make sure it fits the dispenser size (not bigger or smaller) and that you can install it.3. Please install the filter with the flat side up. 1[3 Layers Of Filtration] Pet water fountain filter consists of cotton layer, activated carbon and ion exchange resin to form a three layer filtration system, filtering hair, particles, heavy metals. 2[Applications] Replacement filters are compatible with 84oz, 2.5L square cat water fountains. Used to improve the taste of water and give pets clean, fresh water. 3[Safe And Hygienic] This pet cat water dispenser filter is individually packaged to keep it safe for use and guard your pet's health, so you can use it with confidence. 4[Practical Parts] A total of 12 automatic pet water fountain filters are included, which are recommended to be replaced every 2 to 4 weeks to help pets increase pet water intake. 5[Clean Before Use] To prevent the charcoal dust from falling off, please rinse the water dispenser filter thoroughly with water before use to provide clean water for dogs and cats.